what's the solution?
There are a few alternatives that seek to solve many of the problems posed by conventional agriculture:
Perhaps the most popular one these days is organic foods. The USDA National Organic Program defines organic agriculture as ""an ecological production management system that promotes and enhances biodiversity, biological cycles and soil biological activity. It is based on minimal use of off-farm inputs and on management practices that restore, maintain and enhance ecological harmony." This means that all chemical pesticides, fertilizers and antibiotics are prohibited and all livestock must be fed organic feed and have access to the outdoors. To be labeled an organic product by the USDA, farmers are required to go through a USDA organic certification process. The certification process includes thorough investigation of agricultural records and a large fee. 
Unfortunately, many small farmers cannot afford this fee, even though many meet the organic requirements, so they meet organic requirements but cannot be certified. Some small farms use the term "Certified Naturally Grown" which uses USDA organic standards but is less expensive and regulated locally. Many organic farms emit only half of the carbon emissions produced by industrial farms and use up to a third less energy derived from fossil fuels. It is important to note that organic does not mean local, and you should consider the impact of transporting your food when buying organic.
Unlike organic, local agriculture does not have a legal definition or certification process. Local is relative: it is food grown at home, within your town, state, or even region. The idea is that the less transportation required to deliver your food, the better it is for the environment, since transportation means burning fossil fuels, and that in turn means lots of carbon emissions that contribute to global climate change. Local foods also mean fresher ingredients for you, and oftentimes it means supporting the local agricultural community near where you live. It is important to note that local does not mean organic, but keep an eye out for locally-grown organic foods!
Sustainable agriculture aims to use production practices that cause minimal disturbance to the environment. This is achieved through soil conservation and forest cover in addition to crop rotation. There is no certification for sustainable agriculture, but it is considered to be more holistic than organic agriculture.